Set 10: Linear Equations (Advanced)

Explanation

Answer: B

A store sells notebooks for $4 each and pens for$ 2 each. If Sarah bought 3 notebooks and some pens for a total of $20, how many pens did she buy?

How many pens did Sarah buy?

✓ Correct

Detailed Explanation

Choice B is correct. 3 notebooks cost 3×4 = $12. Remaining: 20 - 12 =$ 8 for pens. At $2 each: 8/2 = 4 pens.

Key Steps:

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The correct answer is 4

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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